42140123 has 2 divisors, whose sum is σ = 42140124. Its totient is φ = 42140122.

The previous prime is 42140107. The next prime is 42140167. The reversal of 42140123 is 32104124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42140123 - 2⁴ = 42140107 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (42140173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21070061 + 21070062.

It is an arithmetic number, because the mean of its divisors is an integer number (21070062).

Almost surely, 2^42140123 is an apocalyptic number.

42140123 is a deficient number, since it is larger than the sum of its proper divisors (1).

42140123 is an equidigital number, since it uses as much as digits as its factorization.

42140123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 42140123 is about 6491.5424207194. The cubic root of 42140123 is about 347.9887998994.

Adding to 42140123 its reverse (32104124), we get a palindrome (74244247).

The spelling of 42140123 in words is "forty-two million, one hundred forty thousand, one hundred twenty-three".